tcg: Convert extrl_i64_i32 to TCGOutOpUnary

Drop the cast from TCGv_i64 to TCGv_i32 in tcg_gen_extrl_i64_i32
an emit extrl_i64_i32 unconditionally.  Move that special case
to tcg_gen_code when we find out if the output is live or dead.
In this way even hosts that canonicalize truncations can make
use of a store directly from the 64-bit host register.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index d3f3c9d248..7ecd1f6c8f 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -2962,11 +2962,9 @@ void tcg_gen_extrl_i64_i32(TCGv_i32 ret, TCGv_i64 arg)
 {
     if (TCG_TARGET_REG_BITS == 32) {
         tcg_gen_mov_i32(ret, TCGV_LOW(arg));
-    } else if (TCG_TARGET_HAS_extr_i64_i32) {
+    } else {
         tcg_gen_op2(INDEX_op_extrl_i64_i32, TCG_TYPE_I32,
                     tcgv_i32_arg(ret), tcgv_i64_arg(arg));
-    } else {
-        tcg_gen_mov_i32(ret, (TCGv_i32)arg);
     }
 }